57
Ion Setup:
Temperature Compensation/Isopotential Point/Alarm Limits
XL25, 50 and 60 meters
Set Apply Temperature Compensation
Ion concentration is a temperature dependent measurement. Best results are obtained when the
standards and the samples are standardized and calibrated at the same temperature. However, if
you have experimentally determined the isopotential point of your electrode then you can choose
to set ATC to YES and enter the isopotential value. This option is set to NO by default.
To set Apply Temperature Compensation
1. Touch
YES
to choose Apply Temperature Compensation.
Set Isopotential Point
The isopotential point is the millivolt reading for an electrode at which temperature has no effect
on the measurement. Ion Selective Electrodes, unlike pH electrodes, are not designed to achieve
any particular isopotential point. If samples and standards are at different temperatures when
performing ISE experiments, it will be necessary to experimentally determine the isopotential
point of your own Ion Specific Electrode.
To set Isopotential Point
1. Touch the
Isopotential Point
box and use the numeric keypad to enter the desired mV
setting for the new isopotential point.
2. Touch
Enter
to accept this value and return to Ion Setup screen.
Set Alarm Limits
This option allows you to set alarm limits for the ion measuring mode. If the ion concentration
value of the measurement is outside of the boundaries set by the minimum and maximum limits,
a visual warning will appear to let you know that your sample measurement was outside of the set
limits.
The validity range of alarm limits is 0.000001 to 99,900,000,000.
To set Alarm Limits
1. Touch
ON
or
OFF
to set the status of the alarm.
2. Touch the
Low box
and use keypad to enter the new limit values.
3. Touch
Enter
on the keypad to accept this limit and return to the Ion Setup screen.
4. Touch the
High box
and use keypad to enter the new limit values.
5. Touch
Enter
on the keypad to accept this limit and return to the Ion Setup screen.
Summary of Contents for XL 20
Page 1: ......
Page 138: ...127 Ion Operation Known Addition Method XL25 50 and 60 meters...
Page 140: ...129 Ion Operation Known Subtraction Method XL25 50 and 60 meters...
Page 142: ...131 Ion Operation Analate Addition Method XL25 50 and 60 meters...
Page 144: ...133 Ion Operation Analate Subtraction Method XL25 50 and 60 meters...